LOUISVILLE, KY. — William Schroeder suffered a brain hemorrhage and was rehospitalized Monday, exactly one month after becoming the first artificial heart patient to live outside a hospital, a spokeswoman said.

Hazle said chief artificial heart surgeon Dr. William DeVries believed the bleeding in the brain had stopped, but had ordered another CT scan on Schroeder in about 48 hours for comparison purposes.

A CT scan -- computerized tomography -- is an advanced X-ray technique that records images of thin cross sections of soft tissue as well as bone, providing a much more detailed image than conventional X-rays, which show only bones and vague outlines of inner organs.

Schroeder, the world's second recipient of a permanent artificial heart, is the longest living artificial heart patient. He has been living at a specially equipped ''halfway house'' across the street from the hospital since April 6. He was readmitted to the coronary care unit, where his condition was listed as critical but stable, Hazle said.